Finding reverse sat current of pn junction diode

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SUMMARY

The discussion centers on determining the reverse saturation current (Is) of a pn junction diode using its IV characteristics. Participants emphasize that reverse saturation current cannot be directly observed from positive forward bias voltage data (0-0.8V) and that reverse bias conditions (V < 0V) are necessary for accurate measurement. The ideal diode current density formula is suggested as a potential approach for calculating Is. Additionally, the need for a general equation for the diode's IV characteristics is highlighted as crucial for understanding the problem.

PREREQUISITES
  • Understanding of pn junction diode operation
  • Familiarity with IV characteristics of diodes
  • Knowledge of the ideal diode current density formula
  • Basic concepts of reverse bias conditions
NEXT STEPS
  • Study the ideal diode current density formula for abrupt pn junctions
  • Research methods to measure reverse saturation current in diodes
  • Learn about the general equation for diode IV characteristics
  • Explore the effects of temperature on diode performance
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in semiconductor device analysis will benefit from this discussion.

ralph13
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Homework Statement


Determine reverse sat current of diode. To show and explain approach. Given-IV characteristics of diode and tabulated values for forward bias voltage from 0-0.8v and corresponding current values.


Homework Equations


At which point do I need to consider to find the reverse sat current


The Attempt at a Solution


using formula of ideal diode current densityfor an abrupt pn junction diode??
 
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it's been a while since I've done diode problems... but from the IV characteristics graph, can't you determine the reverse sat current from the graph? not sure if forward bias voltages help, because you need the diode to be reverse biased (V < 0V) to see reverse sat current... did that help? or maybe I'm just not understanding your question..
 
Welcome to PF, ralph13.

If you are only given or shown the i-v for positive values, between 0 and 0.8V, that rules out a direct observation.

Do you have a general equation for a diode's i-v characteristic?
 

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